How is friction helpful?
From what has been discussed above, it may appear that if there were no friction, our life would have been much more easier and we would not have to spend energy in overcoming the frictional resistance. This is not true. As a matter of fact, it is only because of friction that we are able to move around. Try to run on a very smooth surface and see what happens. As we step forward, friction opposes the forward force, so that the foot does not slip forward.
